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General-Physics-LIGHT dumped with WikiTeam tools.

Topics: wiki, wikiteam, wikispaces, General-Physics-LIGHT, general-physics-light,...

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Jun 30, 2018
06/18

by
Richard Herrmann

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A family of generalized Erdelyi-Kober type fractional integrals is interpreted geometrically as a distortion of the rotationally invariant integral kernel of the Riesz fractional integral in terms of generalized Cassini ovaloids on $R^N$. Based on this geometric view, several extensions are discussed.

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1401.6051

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Jun 30, 2018
06/18

by
Josip Soln

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There has been a lot of interest in measuring the velocities of massive elementary particles, particularly the neutrinos. Some neutrino experi- ments at first observed superluminal neutrinos, thus violating the velocity of light c as a limiting velocity. But, after eliminating some mistakes, such as, for the OPERA experiments plugging the cable correctly and calibrat- ing the clock correctly, the measured neutrino velocity complied with c. Pursuing the theoretical side of particle limiting...

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1403.2683

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Jun 30, 2018
06/18

by
Kimihide Nishimura

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We show that two types of relativistic quasi-fermions can emerge from spontaneous gauge and Lorentz violations of a chiral SU(2) model. In the terminology given in the previous paper, the one consists of "quasi-leptons", and the other consists of "quasi-quarks" which are massless and have anisotropic dispersion relations characterized by constant vector potentials. A low energy approximation shows that quasi fermions of the latter type are interpretable as collective...

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1403.4548

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Jun 30, 2018
06/18

by
Maurice H. P. M. van Putten

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Dark energy inferred from the observed negative deceleration parameter introduces a small mass of the graviton, that satisfies the Higuchi stability condition. It implies an infra-red modification of gravitation that produces Milgrom's inverse distance law of gravitational attraction in excellent agreement with the observed galaxy rotation curves. We conclude that dark matter is present cosmologically with no need for local clustering in galaxies.

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1411.2665

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Jun 30, 2018
06/18

by
A. Aghamohammadi

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We try to study the corresponding relation between f(T ) gravity and holographic dark energy (HDE). A kind of energy density from f(T) is introduced which has the same role as the HDE density. A f(T ) model according to the the HDE model is calculated .We find out a torsion scalar T based on the scalar factor is assumed by (Capoziello,Nojiri et al. 2006). The effective torsion equation of state, deceleration parameter of the holographic f(T )- gravity model are calculated

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1402.2607

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Jun 30, 2018
06/18

by
A. Aghamohammadi; Kh. Saaidi; A. Mohammadi; H. Sheikhahmadi; T. Golanbari; S. W. Rabiei

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Agegraphic dark energy(ADE) and New-ADE models have been introduced as two candidates for dark energy to explain the accelerated expansion phase of the Universe. In spite of a few suitable features of these models some studies have shown that there are several drawbacks in them. Therefore in this investigation a new version of ADE and New-ADE are studied which can improve such drawbacks which appear in the ordinary ADE and New-ADE scenario. In fact we consider an interacting model of scalar...

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1402.2608

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Jun 30, 2018
06/18

by
A. L. Chavda; L. K. Chavda

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The Klein-Gordon equation is solved for di-Holeums (gravitational bound states of two micro black holes) for scalar and vector gravity in its static limit. The relativistic models confirm the predictions of the nonrelativistic Newtonian gravity model, correct to about six significant figures over almost the entire sub-Planck domain. All three models possess a mass range devoid of physics. This is interpreted as evidence that the universe must have more than four dimensions. We show that the...

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1402.3206

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Jun 30, 2018
06/18

by
S. I. Kruglov

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The radiation of vector particles by black holes in (1+2) dimensions is investigated within the WKB approximation. We consider the process of quantum tunnelling of bosons through an event horizon of the black hole. The emission temperature for the Schwarzschild background geometry coincides with the Hawking temperature and for the Rindler spacetime the temperature is the Unruh temperature. We also obtain the radiation temperatures for the de Sitter spacetime.

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1405.0200

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Jun 30, 2018
06/18

by
Walter Schmidt-Parzefall

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A complete set of postulates of the standard model of the electroweak interaction and mass generation is formulated and confirmed deriving the Lagrangian for the standard model. A massive fermion is formed by a right-handed and a left-handed elementary massless fermion, exchanging a scalar doublet. The elementary massless fermions forming leptons belong to an approximate SU(3) octet. The charges are quantised due to this symmetry.

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1406.1412

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Jun 30, 2018
06/18

by
Rasulkhozha S. Sharafiddinov

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The unity of the structure of matter fields with flavor symmetry laws involves that the left-handed neutrino in the field of emission can be converted into a right-handed one and vice versa. These transitions together with classical solutions of the Dirac equation testify in favor of the unidenticality of masses, energies, and momenta of neutrinos of the different components. If we recognize such a difference in masses, energies, and momenta, accepting its ideas about that the left-handed...

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1409.2397

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Jun 30, 2018
06/18

by
George Alexander Davila

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We discuss how the bounds on observation associated with the Planck units would affect an observers perception of a black hole. By simply imposing Planck scale quantities as the lower bounds for length, time, and mass of black hole formation, interesting insights into the nature of black holes can be gained. We also see the emergence of a Planck-scale mass that plays an important role in the observation of black holes and the emergence of a new mechanism for virtual black hole formation.

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1409.4365

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Jun 30, 2018
06/18

by
Piyali Bhar; Farook Rahaman

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We have proposed a new model of dark energy star consisting of five zones namely, solid core of constant energy density, the thin shell between core and interior, an inhomogeneous interior region with anisotropic pressures, thin shell and the exterior vacuum region. We have discussed various physical properties. The model satisfies all the physical requirements. The stability condition under small linear perturbation has also been discussed.

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1409.4394

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Jun 30, 2018
06/18

by
W. L. Kennedy

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The well-known identity involving the expression presented in the above title is considered in Riemannian and in Euclidean space without restriction on the coordinate system adopted therein. The Riemann and Ricci tensors intrinsically assume a defining role in the analysis. The analysis is designed to put an end to the myriad of confusing and mostly incorrect statements about the identity, which are found in textbooks and in the literature.

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1409.5697

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Jun 30, 2018
06/18

by
Marjan-S. Mirahmadi; Amir H. Fatollahi

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The eigenvalue problem for radial potentials is considered in a space whose spatial coordinates satisfy the SU(2) Lie algebra. As the consequence, the space has a lattice nature and the maximum value of momentum is bounded from above. The model shows interesting features due to the bound, namely, a repulsive potential can develop bound-states, or an attractive region may be forbidden for particles to propagate with higher energies. The exact radial eigen-functions in momentum space are given by...

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1401.7903

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Jun 30, 2018
06/18

by
Celso de Araujo Duarte

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Following the line of the history, if by one side the electromagnetic theory was consolidated on the 19th century, the emergence of the special and the general relativity theories on the 20th century opened possibilities of further developments, with the search for the unification of the gravitation and the electromagnetism on a single unified theory. Some attempts to the geometrization of the electromagnetism emerged in this context, where these first models resided strictly on a classical...

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1402.5350

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Jun 30, 2018
06/18

by
I. D. Feranchuk; S. I. Feranchuk

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It is shown that the total energy of the vacuum fluctuations of the electron-positron and electromagnetic fields in the quantum electrodynamics can be equal to zero if the "bare" electron charge is chosen by adequate way. The value of "bare" electron charge calculated from this condition proves to be in a qualitative agreement with that one which was found independently from the solution of the "physical electron" problem.

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1403.1483

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Jun 30, 2018
06/18

by
G. Abbas

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Few years ago, Setare \cite{1} has investigated the Cardy-Verlinde formula of non-commutative black hole obtained by non-commutativity of coordinates. In this paper, we apply the same procedure to a non-commutative black hole obtained by the co-ordinate coherent approch. The Cardy-Verlinde formula is entropy formula of conformal field theory in an arbitrary dimension. It relates the entropy of conformal filed theory to its total energy and Casimir energy. In this paper, we have calculated the...

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1403.5467

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Jun 30, 2018
06/18

by
S. S. Gershtein; A. A. Logunov; M. A. Mestvirishvili

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It is shown that a gravitational compression of a spherical body results in an infinite growth of the energy of a body as its radius comes close to $GM/c^2$. This gives rise to a negative defect of mass and, due to an instability, to an expansion or to an explosion. A rigorous proof of the above statement can be obtained within the General Relativity in the harmonic coordinates.

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1404.3687

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Jun 30, 2018
06/18

by
Ja. V. Balitsky; V. V. Kiselev

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We consider equations of modified gravity involving critical accelerations and find its solutions for the point-like source by suggesting the appropriate symmetry of metrics in the empty space-time.

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1404.3685

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Jun 30, 2018
06/18

by
Jerrold Franklin

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We resolve a paradox in special relativity proposed by F. W. Sears for the action of forces on a rigid body. In the paradox, a moving rigid rod is struck at different times by impulsive forces, but continues to move with unchanged velocity, with the forces having no effect. Our conclusion is that the usual laws of mechanics can be applied to a rigid body only in its rest system

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1405.5180

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Jun 30, 2018
06/18

by
Christian Rakotonirina

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We construct two sets of representations of the Dirac equation. They transform themselves from one to another in multiplying by the tensor commutation matrix (TCM) $2\otimes 2$. The Gauss matrix can lead us to the Cholesky decomposition. The TCMs can be used in order to obtain different transforms of some matrix equations to linear matrix equations of the form $AX=B$. A TCM $n\otimes n$ is expressed in terms of the $n\otimes n$-Gell-Mann matrices. In order to generalize this expression to which...

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1405.7668

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Jun 30, 2018
06/18

by
O. Brauer; H. A. Camargo; M. Socolovsky

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We study proper time ($\tau$) intervals for observers at rest in the universe ($U$) and anti-universe ($\bar{U}$) sectors of the Kruskal-Schwarzschild eternal spacetime of mass $M$, and proper lengths ($\rho$) in the black hole (BH) and white hole (WH) sectors. The fact that in asymptotically flat regions, coordinate time $t$ at infinity is proper time, leads to a past directed Kruskal time $T$ in $\bar{U}$. In the BH and WH sectors maximal proper lengths coincide with maximal proper time...

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1406.2350

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Jun 30, 2018
06/18

by
Mohammad Ghanaatian; Farzad Milani

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In this study, FRW cosmology in modified gravity containing arbitrary function $f(R)$ is taken into consideration when our action are coupled with Weyl tensor. It is indicated that the bouncing solution emerges in the model while the equation of state (EoS) parameter crosses the phantom divider. In this research, cosmological usage of the most promising candidates of dark energy in the framework of $f(R)$ theory coupled by Weyl tensor is explored. A $f(R)$ gravity model in the spatially flat...

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1403.6178

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Jun 30, 2018
06/18

by
Manfred Schmid; Pavel Kroupa

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We construct an idealized universe for didactic purposes. This universe is assumed to consist of absolute Euclidean space and to be filled with a classical medium which allows for sound waves. A known solution to the wave equation describing the dynamics of the medium is a standing spherical wave. Although this is a problem of classical mechanics, we demonstrate that the Lorentz transformation is required to generate a moving solution from the stationary one. Both solutions are here...

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1408.6195

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Jun 28, 2018
06/18

by
Alexei M. Frolov

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Basic principles of the Hamilton approach developed for the metric General Relativity (Einstein`s GR) are discussed. In particular, we derive the Hamiltonian of the metric GR in the explicit form. This Hamiltonian is a quadratic function of the momenta $\pi^{mn}$ conjugate to the spatial components $g_{mn}$ of the metric tensor $g_{\alpha\beta}$. The Hamilton approach is used to analyze some problems of metric GR, including the internal structure of propagating gravitational waves and...

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1509.08928

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Jun 28, 2018
06/18

by
V. O. Thomas; D. M. Pandya

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In this paper a new class of exact solutions of Einstein's field equations for compact stars with charged distributions is obtained on the basis of pseudo-spheroidal spacetime characterized by the metric potential $g_{rr}=\frac{1+K\frac{r^{2}}{R^{2}}}{1+\frac{r^{2}}{R^{2}}}$, where $K$ and $R$ are geometric parameters of the spacetime. The expressions for radial pressure ($ p_r $) and electric field intensity ($ E $) are chosen in such a way that the model falls in the category of physically...

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1511.04399

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Jun 29, 2018
06/18

by
Pu Tian

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Free energy is arguably the most importance function(al) for understanding of molecular systems. A number of rigorous and approximate free energy calculation/estimation methods have been developed over many decades. One important issue, the continuity of an interested macrostate (or path) in configurational space, has not been well articulated, however. As a matter of fact, some important special cases have been intensively discussed. In this perspective, I discuss the relevance of...

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1602.07959

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Jun 29, 2018
06/18

by
H. Ghaffarnejad; M. Farsam

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In ref. [1] we showed that a quantum unstable Reissner-Nordst\"{o}m black hole $(RNBH)$ with ratio of mass per charge $m=\frac{M}{e},$ evaporates in presence of backreaction effects of mass-less, charge-less quantum scalar fields. Finally its mass reaches to minimum value as $m_{final}=1$ and its luminosity vanishes. There was obtained a critical temperature corresponding to a critical mass $m_c=\frac{2}{\sqrt{3}}$ for which the single RNBH exhibits with first order phase transition and...

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1603.08408

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Jun 29, 2018
06/18

by
Leonid I. Slepyan

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For steady-state and some other types of mechanical waves of an arbitrary form, intensity and nature, propagating in a free uniform waveguide, we present the following. Relations for the axial momentum as it directly follows from the conservation laws. The mass associated with the wave. The connection between the wave energy and momentum. The structure of a binary wave which possesses a self-equilibrated momentum, in particular, a transverse-longitudinal wave formed upon excitation of flexural...

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1603.08960

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Jun 29, 2018
06/18

by
Mohsen Fathi; Morteza Mohseni

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Taking a quantum corrected form of Raychaudhuri equation in a geometric background described by a Lorentz-violating massive theory of gravity, we go through investigating a time-like congruence of massive gravitons affected by a Bohmian quantum potential. We find some definite conditions upon which these gravitons are confined to diverging Bohmian trajectories. The respective behaviour of those quantum potentials are also derived and discussed. Additionally, and through a relativistic quantum...

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1604.01619

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Jun 29, 2018
06/18

by
M. Azam; S. A. Mardan; I. Noreen; M. A. Rehman

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The aim of this paper is to discuss the theory of Newtonian and relativistic polytropes with generalized polytropic equation of state. For this purpose, we formulated the general framework to discuss the physical properties of polytrops with anisotropic inner fluid distribution under conformally flat condition in the presence of charge. We investigate the stability of these polytrops in the vicinity of generalized polytropic equation through Tolman-mass. It is concluded that one of the derived...

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1605.02308

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Jun 29, 2018
06/18

by
M. Sharif; Rubab Manzoor

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This paper is devoted to study cylindrically symmetric stellar filaments in self-interacting Brans-Dicke gravity. For this purpose, we construct polytropic filamentary models through generalized Lane-Emden equation in Newtonian regime. The resulting models depend upon the values of cosmological constant (due to scalar field) along with polytropic index and represent a generalization of the corresponding models in general relativity. We also investigate fragmentation of filaments by exploring...

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1605.02565

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Jun 29, 2018
06/18

by
Roman Matsyuk

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I proffer a development of some third order equation of motion for the free relativistic top from the simultaneously imposed assumptions of variationality and Lorentz symmetry.

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1605.02547

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Jun 29, 2018
06/18

by
Partha Ghose

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It is first argued that radiation by a uniformly accelerated charge in flat space-time indicates the need for a unified geometric theory of gravity and electromagnetism. Such a theory, based on a metric-affine $U_4$ manifold, is constructed with the torsion pseudo-vector $\Gamma_\mu$ linking gravity and electromagnetism. This conceptually simple extension results in (i) Einstein's equations being modified by a vacuum energy $\Gamma_\mu\Gamma_\nu$ and a scalar field $\Gamma =...

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1605.08263

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Jun 28, 2018
06/18

by
Amir H. Fatollahi

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The proposed coordinate/field duality [Phys. Rev. Lett. 78 (1997) 163] is applied to the gauge and matter sectors of gauge theories. In the non-Abelian case, due to indices originated from the internal space, the dual coordinates appear to be matrices. The dimensions and the transformations of the matrix coordinates of gauge and matter sectors are different and are consistent to expectations from lattice gauge theory and the theory of open strings equipped with the Chan-Paton factors. It is...

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1511.07328

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Jun 28, 2018
06/18

by
Niels G. Gresnigt; Adam B. Gillard

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Lie-type deformations provide a systematic way of generalising the symmetries of modern physics. Deforming the isometry group of Minkowski spacetime through the introduction of a minimal length scale $\ell$ leads to anti de Sitter spacetime with isometry group $SO(2,3)$. Quantum spacetime on scales of the order $\ell$ therefore carries negative curvature. Considering extended particles of characteristic size $\ell$ carrying topological information and requiring that their topological properties...

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1512.04339

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Jun 28, 2018
06/18

by
G. B. Tupper. M Marais; J. A. Helayël

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The Stephani universe is an inhomogeneous alternative to $\Lambda{\rm CDM}$ .We show that the exotic fluid driving the Stephani exact solution of Einstein's equations is an unusual form of k-essence that is linear in "velocity". Much as the Stephani universe can be embedded into (a section of) flat 5-d Minkowski space-time, we show that the k-essence obtains through dimensional reduction of a 5-d strongly coupled non-linear "electrodynamics" that, in the empty Stephani...

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1512.05204

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Jun 29, 2018
06/18

by
I. Sahin

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It is firmly established by experimental results that neutrinos are almost 100\% longitudinally polarized and left-handed. It is also confirmed by neutrino oscillation experiments that neutrinos have tiny but non-zero masses. Since their masses are non-zero the neutrinos cannot be strictly described by pure helicity states which coincide with the chirality eigenstates. On the other hand, it is generally assumed that ultrarelativistic massive fermions can be described well enough by the Weyl...

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1601.00627

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Jun 29, 2018
06/18

by
Sergey V. Dvoryaninov; Vladimir O. Soloviev

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The Universe dynamical equations discovered by Alexander Friedmann in 1922 are simple enough to be clear for undergraduate students or even for smart senior schoolkids. The background cosmology driven by the dust-like matter and by positive cosmological constant in General Relativity can be understood as a radial motion of a test particle in the superposition of Newtonian and anti-Hook potentials according to Newtonian mechanics. This analogy was mentioned by George Gamov in his book (1952)....

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1607.03402

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Jun 29, 2018
06/18

by
Robert D. Bock

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We identify a fundamental space-time invariance principle by combining the thesis of the conventionality of simultaneity with the Hugyens-Fresnel-Miller model of wave propagation. By following the standard gauge prescription, we show that the classical electromagnetic potentials influence the one-way speed of light.

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1608.01544

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Jun 29, 2018
06/18

by
Ashok K. Singal

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We address here the question of interference of radio signals from astronomical sources like distant quasars, in a very long baseline interferometer (VLBI), where two (or more) distantly located radio telescopes (apertures), receive simultaneous signal from the sky. In an equivalent optical two-slit experiment, it is generally argued that for the photons involved in the interference pattern on the screen, it is not possible, even in principle, to know which of the two slits a particular photon...

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1608.02672

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Jun 29, 2018
06/18

by
Hitoshi Inamori

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Environment induced decoherence, and other quantum processes, have been proposed in the literature to explain the apparent spontaneous selection - out of the many mathematically eligible bases - of a privileged measurement basis that corresponds to what we actually observe. This paper describes such processes, and demonstrates that - contrary to common belief - no such process can actually lead to a preferred basis in general. The key observation is that environment induced decoherence...

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1609.07984

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Jun 30, 2018
06/18

by
B. Pourhassan; S. Upadhyay; H. Farahani

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In this paper, we consider higher order correction of the entropy and study the thermodynamical properties of recently proposed Schwarzschild-Beltrami-de Sitter black hole, which is indeed an exact solution of Einstein equation with a positive cosmological constant. By using the corrected entropy and Hawking temperature we extract some thermodynamical quantities like Gibbs and Helmholtz free energies and heat capacity. We also investigate the first and second laws of thermodynamics. We find...

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1701.08650

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Jun 30, 2018
06/18

by
I. Sahin

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It is generally assumed that neutrino masses can be neglected to a high degree of approximation in cross section calculations. This assumption seems very reasonable since the neutrino masses are extremely small and the neutrinos are ultrarelativistic fermions at the energy scales of current experiments. Consequently, in cross section calculations in the Quantum Field Theory, the Standard Model neutrinos are frequently assumed to be described by 100% negative helicity states. This assumption is...

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1701.08666

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Jun 30, 2018
06/18

by
Igor Bulyzhenkov

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Heat transfer in the SR flow of power, rather than the Newton current of cold masses, provides proper referents for GR geodesic motion of inertial energy and for metric of non-empty space. GR can compare losses of internal energy under speed increases and can explain the attraction law by the body tendency toward equipartition of kinetic energies over internal and external degrees of freedom. Thermodynamic approach numerically describes the cyclic dynamics of the vertical fall to center with...

Topics: Physics, General Physics

Source: http://arxiv.org/abs/1702.02018

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Jun 29, 2018
06/18

by
Serge Wagner

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Physics textbooks present Minkowski space as an almost pure mathematical construct, without any explicit restriction on a domain where it is applicable in physics. Meanwhile, its physical meaning cannot but follow the same premises as those which underlies the special relativity theory: motion of free point particles and propagation of electromagnetic waves. However, the common formalism of coordinate transformations between any two inertial frames appears too ponderous to infer the existence...

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1610.00992

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Jun 29, 2018
06/18

by
B Behera; T R Routray; S K Tripathy

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High density behaviour of nuclear symmetry energy is studied on the basis of a stiffest density dependence of asymmetric contribution to energy per nucleon in charge neutral $n+p+e+\mu$ matter under beta equilibrium. The density dependence of nuclear symmetry energy obtained in this way is neither very stiff nor soft at high densities and is found to be in conformity with recent observations of neutron stars

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1610.06789

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Jun 29, 2018
06/18

by
Zi-Hua Weng

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The paper focuses on finding out several physical quantities to exert an influence on the spatial parameters of complex-octonion curved space, including the metric coefficient, connection coefficient, and curvature tensor. In the flat space described with the complex octonions, the radius vector is combined with the integrating function of field potential to become a composite radius vector. And the latter can be considered as the radius vector in a flat composite-space (a function space)....

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1611.01019

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Jun 29, 2018
06/18

by
G. S. Khadekar; Saibal Ray; X. -H. Meng

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In this paper we solve Friedmann equations by considering a universal media as a non-perfect fluid with bulk viscosity and is described by a general "gamma law" equation of state of the form $p= (\gamma -1) \rho + \Lambda(t)$, where the adiabatic parameter $\gamma$ varies with scale factor $R$ of the metric and $\Lambda$ is the time dependent cosmological constant. A unified description of the early evolution of the universe is presented by assuming the bulk viscosity and cosmological...

Topics: General Physics, Physics

Source: http://arxiv.org/abs/1611.01023